Data Monday: More Mobile Engagement

A while ago I looked at the engagement several Web companies were getting on mobile. Here's an updated look.

It took the iPhone application Instagram only three months to hit one million users. It took Foursquare a full year and Twitter two years. (source)

Six weeks later Instagram hit two million users. They remain an iOS-only application. They don’t even have a web presence where you can sign up. (source)

3.2 million unique visitors used a Yelp mobile app in December 2010. 35% of all searches on Yelp.com came from a Yelp mobile app. Every other second a consumer generated directions to a local business and a photo was uploaded every 30 seconds from a Yelp mobile app. (source)